patch 7.4.1869
Problem:    Can't build with old version of Perl.
Solution:   Define PERLIO_FUNCS_DECL. (Tom G. Christensen)
diff --git a/src/version.c b/src/version.c
index ea58610..ed479cd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1869,
+/**/
     1868,
 /**/
     1867,